Glossary.pdf


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1/26/2018

TestOut LabSim
Separate connection settings for internal and external connectivity
The URLs for Exchange features associated with the user
Outlook Anywhere server settings
APIPA is a Microsoft implementation of automatic IP address assignment without a DHCP server. Using APIPA, hosts assign
themselves an IP address on the 169.254.0.0 network (mask of 255.255.0.0). With APIPA:

Automatic Private
IP Addressing
(APIPA)

Autonomous
System (AS)
Autonomous
System Boundary
Router (ASBR)

Autosummarization

The host is configured to obtain IP information from a DHCP server (this is the default configuration).
If a DHCP server can't be contacted, the host uses APIPA to assign itself an IP address.
The host only configures the IP address and mask. It does not assign itself the default gateway and DNS server addresses. For
this reason, APIPA can only be used on a single subnet.
An Autonomous System (AS) is a set of routers under a common administration and with common routing policies. Each Autonomous
System (AS) in BGP appears to other autonomous systems to have a single coherent interior routing plan.
An Autonomous System Boundary Router (ASBR) is a router that has an interface to an external autonomous system (e.g. RIP or
EIGRP). ASBRs can import and export non-OSPF network information to and from the OSPF network.
Autosummarization transpires when a router that uses a classful routing protocol sends and update about a subnet of a classful
network across an interface belonging to a different classful network and assumes that the remote router will use the default subnet
mask for that class of IP address.
The following protocols use autosummarization:
RIP
EIGRP
BGP

AWG (American
Wire Gauge)

A U.S. standard set of wire sizes that apply to copper wires, including household electrical wiring and telephone lines. The higher the
number, the thinner the wire.

B

Back end
Backbone area

Backbone router

The server where database operations occur. The back end fulfills client requests by receiving structured requests from the client,
processing the requests, and returning the results. It is usually more powerful than the client.
A backbone area acts as a hub for inter-area transit traffic and the distribution of routing information between areas. All OSPF
networks have at least one backbone area, also known as an area 0.
A backbone router is located in the perimeter of the backbone area. Backbone routers:
Maintain OSPF routing information using the same procedures and algorithms as internal routers.
Have at least one interface that is connected to area 0.

Backup Designated
Router (BDR)
Backup Domain
Controller (BDC)
Backup log
Backup marker

On each subnet, a single OSPF router is identified as the Backup Designated Router (BDR). The BDR becomes the Designated
Router (DR) if the DR becomes unavailable.
A server containing a replicated copy of the domain database. Each Windows NT domain will have one PDC (Primary Domain
Controller) with zero or more BDCs (backup domain controllers).
A text file that records backup operations. The log is helpful when restoring data. You can print it or read it in a text editor.
Windows Backup can set a backup marker, also known as the archive attribute, indicating that the file has been backed up.
A group that has permission to perform backups on a system. This group should have only sufficient rights to perform a backup. They
Backup Operators
typically use the Windows backup software.
A term used to describe a group of files or folders on a single volume from a single backup operation. A group of tapes is called a
Backup set
family set.
Baseband
Baseband signalling allows one signal at a time on the network medium (cabling).
A server baseline is a snapshot of the performance statistics of your server that is used as a logical basis for future
Baseline
comparison. Server baselines enable you to effectively monitor the performance of your system to determine when changes
negatively impact performance or when systems need upgrading or replacing.
Baselining
Documenting a network's average performance statistics over time.
An authentication method that requires the user to enter a valid username and password for a Windows user account. This
Basic authentication
information passes between the server and client in clear text.
A physical disk containing primary partitions, extended partitions, or logical drives. Using Windows NT 4.0 or earlier, you can create
Basic disk
RAID-5 volumes for basic disks; they can also be spanned, mirrored, or part of a stripe set. MS-DOS can access basic disks.
Compare dynamic disk.
Basic multicast supports multicast applications within an enterprise campus. It is an interactive, intra-domain form of multicast that
Basic multicast
provides integrity within a network when combined with a reliable multicast transport such as PGM.
Batch file
A set of commands used to perform a specific operation on a computer.
The number of bits per second that are physically signaled over a communication medium. The term "baud" originally referred to the
Baud rate
number of dots per second that could be signaled using Morse code over particular telegraph systems. The unit of measure was
named after J.M.E. Baudot, the developer of the first printer for telegraph systems.
BDC (Backup
A server containing a replicated copy of the domain database. Each Windows NT domain will have one PDC (Primary Domain
Domain Controller) Controller) with zero or more BDCs (backup domain controllers).
BDR (Backup
On each subnet, a single OSPF router is identified as the Backup Designated Router (BDR). The BDR becomes the Designated
Designated Router) Router (DR) if the DR becomes unavailable.
Using the split horizon method (also called best information), routers keep track of where the information about a route came from.
Best information
Routers do not report route information to the routers on that path. In other words, routers do not report information back to the router
from which their information originated.
BGP (Border
Border Gateway Protocol (BGP) is a policy-based, interautonomous system routing protocol that exchanges reachability information
Gateway Protocol) with other BGP systems.
BGP Address
The Cisco BGP Address Family Identifier (AFI) model was introduced with multiprotocol BGP. It is designed to be scalable and
Family Identifier
modular, and to support multiple AFI and Subsequent Address Family Identifier (SAFI) configurations.
(AFI)
BGP attributes
BGP attributes are used to select the best path to be entered into the routing table and propagated to the BGP neighbors. BGP
attributes can be well-known mandatory, well-known discretionary, optional transitive, or optional nontransitive. The following
definitions are used to define BGP attributes:

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